# CVE-2020-7491: **VERSION NOT SUPPORTED WHEN ASSIGNED** A legacy debug port account in TCMs installed in Tricon system versions 10.2.0 through 10.5.3 is vis


- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 23 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-6q95-r497-79jw

## What is CVE-2020-7491?

CVE-2020-7491 is a high-severity vulnerability in Tricon system versions 10.2.0 through 10.5.3, published on 23 Jul 2020. 

### Official description

**VERSION NOT SUPPORTED WHEN ASSIGNED** A legacy debug port account in TCMs installed in Tricon system versions 10.2.0 through 10.5.3 is visible on the network and could allow inappropriate access. This vulnerability was remediated in TCM version 10.5.4.

## Which versions are affected by CVE-2020-7491?

It affects 7 products.


Products: Schneider-Electric Tricon Tcm 4351 Firmware, Schneider-Electric Tricon Tcm 4351a Firmware, Schneider-Electric Tricon Tcm 4351b Firmware, Schneider-Electric Tricon Tcm 4352 Firmware, Schneider-Electric Tricon Tcm 4352a Firmware, Schneider-Electric Tricon Tcm 4352b Firmware, Schneider-Electric Tristation 1131 Firmware.

## How do I fix CVE-2020-7491?

No fix has been published for CVE-2020-7491 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-7491 being exploited?

There is no known exploitation of CVE-2020-7491 in the wild and no public exploit code.

## Other vulnerabilities in Tricon system versions 10.2.0 through 10.5.3

- [CVE-2020-7486](https://insights.sbomify.com/CVE-2020-7486/): Denial of service in Tricon TCM Model 4351, 4352, 4351A/B, 4352A/B (v10.3.x, v10.4.x) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7491 and fix it if it is affected.

What it is: CVE-2020-7491 is a high-severity vulnerability in Tricon system versions 10.2.0 through 10.5.3, published on 23 Jul 2020. 
Exploitation: There is no known exploitation of CVE-2020-7491 in the wild and no public exploit code.

Affected product: Tricon system versions 10.2.0 through 10.5.3. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-7491/ (Markdown: https://insights.sbomify.com/CVE-2020-7491/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7491
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7491
- OSV: https://osv.dev/vulnerability/CVE-2020-7491

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7491/
Summaries are generated and may contain mistakes; the official description above is the record.